orthotics
walk fit, available from walkfit.com $19.95
painful to use for a few days at first, but then you get used to them. I can now run camera standing for an hour straight without my feet hurting with the inserts in my tennis shoes. also, I had a crick in my heel and these relieved the pain.
Z-CoiL Pain Relief Footwear, available from zcoil.com $200-300/pair.
From what I have heard from someone who has bought a pair, these are worth it.